
/TRACK
Multiple Recipients of a message (multiple IDs as well for backward
  compatibility)
New (improved) forwarding protocol
Auto-decode 7plus, and various experiments on 7plus
Binary file propogation
Inteligent forwarding queueing and re-queueing
Automatic routing table updates


Some ideas I've noted from others:

National/International file database (with info propogated like WP).
